1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * PS3 flash memory os area. 4 * 5 * Copyright (C) 2006 Sony Computer Entertainment Inc. 6 * Copyright 2006 Sony Corp. 7 */ 8 9#include <linux/kernel.h> 10#include <linux/io.h> 11#include <linux/workqueue.h> 12#include <linux/fs.h> 13#include <linux/syscalls.h> 14#include <linux/export.h> 15#include <linux/ctype.h> 16#include <linux/memblock.h> 17#include <linux/of.h> 18#include <linux/slab.h> 19 20#include <asm/prom.h> 21 22#include "platform.h" 23 24enum { 25 OS_AREA_SEGMENT_SIZE = 0X200, 26}; 27 28enum os_area_ldr_format { 29 HEADER_LDR_FORMAT_RAW = 0, 30 HEADER_LDR_FORMAT_GZIP = 1, 31}; 32 33#define OS_AREA_HEADER_MAGIC_NUM "cell_ext_os_area" 34 35/** 36 * struct os_area_header - os area header segment. 37 * @magic_num: Always 'cell_ext_os_area'. 38 * @hdr_version: Header format version number. 39 * @db_area_offset: Starting segment number of other os database area. 40 * @ldr_area_offset: Starting segment number of bootloader image area. 41 * @ldr_format: HEADER_LDR_FORMAT flag. 42 * @ldr_size: Size of bootloader image in bytes. 43 * 44 * Note that the docs refer to area offsets. These are offsets in units of 45 * segments from the start of the os area (top of the header). These are 46 * better thought of as segment numbers. The os area of the os area is 47 * reserved for the os image. 48 */ 49 50struct os_area_header { 51 u8 magic_num[16]; 52 u32 hdr_version; 53 u32 db_area_offset; 54 u32 ldr_area_offset; 55 u32 _reserved_1; 56 u32 ldr_format; 57 u32 ldr_size; 58 u32 _reserved_2[6]; 59}; 60 61enum os_area_boot_flag { 62 PARAM_BOOT_FLAG_GAME_OS = 0, 63 PARAM_BOOT_FLAG_OTHER_OS = 1, 64}; 65 66enum os_area_ctrl_button { 67 PARAM_CTRL_BUTTON_O_IS_YES = 0, 68 PARAM_CTRL_BUTTON_X_IS_YES = 1, 69}; 70 71/** 72 * struct os_area_params - os area params segment. 73 * @boot_flag: User preference of operating system, PARAM_BOOT_FLAG flag. 74 * @num_params: Number of params in this (params) segment. 75 * @rtc_diff: Difference in seconds between 1970 and the ps3 rtc value. 76 * @av_multi_out: User preference of AV output, PARAM_AV_MULTI_OUT flag. 77 * @ctrl_button: User preference of controller button config, PARAM_CTRL_BUTTON 78 * flag. 79 * @static_ip_addr: User preference of static IP address. 80 * @network_mask: User preference of static network mask. 81 * @default_gateway: User preference of static default gateway. 82 * @dns_primary: User preference of static primary dns server. 83 * @dns_secondary: User preference of static secondary dns server. 84 * 85 * The ps3 rtc maintains a read-only value that approximates seconds since 86 * 2000-01-01 00:00:00 UTC. 87 * 88 * User preference of zero for static_ip_addr means use dhcp. 89 */ 90 91struct os_area_params { 92 u32 boot_flag; 93 u32 _reserved_1[3]; 94 u32 num_params; 95 u32 _reserved_2[3]; 96 /* param 0 */ 97 s64 rtc_diff; 98 u8 av_multi_out; 99 u8 ctrl_button; 100 u8 _reserved_3[6]; 101 /* param 1 */ 102 u8 static_ip_addr[4]; 103 u8 network_mask[4]; 104 u8 default_gateway[4]; 105 u8 _reserved_4[4]; 106 /* param 2 */ 107 u8 dns_primary[4]; 108 u8 dns_secondary[4]; 109 u8 _reserved_5[8]; 110}; 111 112#define OS_AREA_DB_MAGIC_NUM "-db-" 113 114/** 115 * struct os_area_db - Shared flash memory database. 116 * @magic_num: Always '-db-'. 117 * @version: os_area_db format version number. 118 * @index_64: byte offset of the database id index for 64 bit variables. 119 * @count_64: number of usable 64 bit index entries 120 * @index_32: byte offset of the database id index for 32 bit variables. 121 * @count_32: number of usable 32 bit index entries 122 * @index_16: byte offset of the database id index for 16 bit variables. 123 * @count_16: number of usable 16 bit index entries 124 * 125 * Flash rom storage for exclusive use by guests running in the other os lpar. 126 * The current system configuration allocates 1K (two segments) for other os 127 * use. 128 */ 129 130struct os_area_db { 131 u8 magic_num[4]; 132 u16 version; 133 u16 _reserved_1; 134 u16 index_64; 135 u16 count_64; 136 u16 index_32; 137 u16 count_32; 138 u16 index_16; 139 u16 count_16; 140 u32 _reserved_2; 141 u8 _db_data[1000]; 142}; 143 144/** 145 * enum os_area_db_owner - Data owners. 146 */ 147 148enum os_area_db_owner { 149 OS_AREA_DB_OWNER_ANY = -1, 150 OS_AREA_DB_OWNER_NONE = 0, 151 OS_AREA_DB_OWNER_PROTOTYPE = 1, 152 OS_AREA_DB_OWNER_LINUX = 2, 153 OS_AREA_DB_OWNER_PETITBOOT = 3, 154 OS_AREA_DB_OWNER_MAX = 32, 155}; 156 157enum os_area_db_key { 158 OS_AREA_DB_KEY_ANY = -1, 159 OS_AREA_DB_KEY_NONE = 0, 160 OS_AREA_DB_KEY_RTC_DIFF = 1, 161 OS_AREA_DB_KEY_VIDEO_MODE = 2, 162 OS_AREA_DB_KEY_MAX = 8, 163}; 164 165struct os_area_db_id { 166 int owner; 167 int key; 168}; 169 170static const struct os_area_db_id os_area_db_id_empty = { 171 .owner = OS_AREA_DB_OWNER_NONE, 172 .key = OS_AREA_DB_KEY_NONE 173}; 174 175static const struct os_area_db_id os_area_db_id_any = { 176 .owner = OS_AREA_DB_OWNER_ANY, 177 .key = OS_AREA_DB_KEY_ANY 178}; 179 180static const struct os_area_db_id os_area_db_id_rtc_diff = { 181 .owner = OS_AREA_DB_OWNER_LINUX, 182 .key = OS_AREA_DB_KEY_RTC_DIFF 183}; 184 185#define SECONDS_FROM_1970_TO_2000 946684800LL 186 187/** 188 * struct saved_params - Static working copies of data from the PS3 'os area'. 189 * 190 * The order of preference we use for the rtc_diff source: 191 * 1) The database value. 192 * 2) The game os value. 193 * 3) The number of seconds from 1970 to 2000. 194 */ 195 196static struct saved_params { 197 unsigned int valid; 198 s64 rtc_diff; 199 unsigned int av_multi_out; 200} saved_params; 201 202static struct property property_rtc_diff = { 203 .name = "linux,rtc_diff", 204 .length = sizeof(saved_params.rtc_diff), 205 .value = &saved_params.rtc_diff, 206}; 207 208static struct property property_av_multi_out = { 209 .name = "linux,av_multi_out", 210 .length = sizeof(saved_params.av_multi_out), 211 .value = &saved_params.av_multi_out, 212}; 213 214 215static DEFINE_MUTEX(os_area_flash_mutex); 216 217static const struct ps3_os_area_flash_ops *os_area_flash_ops; 218 219void ps3_os_area_flash_register(const struct ps3_os_area_flash_ops *ops) 220{ 221 mutex_lock(&os_area_flash_mutex); 222 os_area_flash_ops = ops; 223 mutex_unlock(&os_area_flash_mutex); 224} 225EXPORT_SYMBOL_GPL(ps3_os_area_flash_register); 226 227static ssize_t os_area_flash_read(void *buf, size_t count, loff_t pos) 228{ 229 ssize_t res = -ENODEV; 230 231 mutex_lock(&os_area_flash_mutex); 232 if (os_area_flash_ops) 233 res = os_area_flash_ops->read(buf, count, pos); 234 mutex_unlock(&os_area_flash_mutex); 235 236 return res; 237} 238 239static ssize_t os_area_flash_write(const void *buf, size_t count, loff_t pos) 240{ 241 ssize_t res = -ENODEV; 242 243 mutex_lock(&os_area_flash_mutex); 244 if (os_area_flash_ops) 245 res = os_area_flash_ops->write(buf, count, pos); 246 mutex_unlock(&os_area_flash_mutex); 247 248 return res; 249} 250 251 252/** 253 * os_area_set_property - Add or overwrite a saved_params value to the device tree. 254 * 255 * Overwrites an existing property. 256 */ 257 258static void os_area_set_property(struct device_node *node, 259 struct property *prop) 260{ 261 int result; 262 struct property *tmp = of_find_property(node, prop->name, NULL); 263 264 if (tmp) { 265 pr_debug("%s:%d found %s\n", __func__, __LINE__, prop->name); 266 of_remove_property(node, tmp); 267 } 268 269 result = of_add_property(node, prop); 270 271 if (result) 272 pr_debug("%s:%d of_set_property failed\n", __func__, 273 __LINE__); 274} 275 276/** 277 * os_area_get_property - Get a saved_params value from the device tree. 278 * 279 */ 280 281static void __init os_area_get_property(struct device_node *node, 282 struct property *prop) 283{ 284 const struct property *tmp = of_find_property(node, prop->name, NULL); 285 286 if (tmp) { 287 BUG_ON(prop->length != tmp->length); 288 memcpy(prop->value, tmp->value, prop->length); 289 } else 290 pr_debug("%s:%d not found %s\n", __func__, __LINE__, 291 prop->name); 292} 293 294static void dump_field(char *s, const u8 *field, int size_of_field) 295{ 296#if defined(DEBUG) 297 int i; 298 299 for (i = 0; i < size_of_field; i++) 300 s[i] = isprint(field[i]) ? field[i] : '.'; 301 s[i] = 0; 302#endif 303} 304 305#define dump_header(_a) _dump_header(_a, __func__, __LINE__) 306static void _dump_header(const struct os_area_header *h, const char *func, 307 int line) 308{ 309 char str[sizeof(h->magic_num) + 1]; 310 311 dump_field(str, h->magic_num, sizeof(h->magic_num)); 312 pr_debug("%s:%d: h.magic_num: '%s'\n", func, line, 313 str); 314 pr_debug("%s:%d: h.hdr_version: %u\n", func, line, 315 h->hdr_version); 316 pr_debug("%s:%d: h.db_area_offset: %u\n", func, line, 317 h->db_area_offset); 318 pr_debug("%s:%d: h.ldr_area_offset: %u\n", func, line, 319 h->ldr_area_offset); 320 pr_debug("%s:%d: h.ldr_format: %u\n", func, line, 321 h->ldr_format); 322 pr_debug("%s:%d: h.ldr_size: %xh\n", func, line, 323 h->ldr_size); 324} 325 326#define dump_params(_a) _dump_params(_a, __func__, __LINE__) 327static void _dump_params(const struct os_area_params *p, const char *func, 328 int line) 329{ 330 pr_debug("%s:%d: p.boot_flag: %u\n", func, line, p->boot_flag); 331 pr_debug("%s:%d: p.num_params: %u\n", func, line, p->num_params); 332 pr_debug("%s:%d: p.rtc_diff %lld\n", func, line, p->rtc_diff); 333 pr_debug("%s:%d: p.av_multi_out %u\n", func, line, p->av_multi_out); 334 pr_debug("%s:%d: p.ctrl_button: %u\n", func, line, p->ctrl_button); 335 pr_debug("%s:%d: p.static_ip_addr: %u.%u.%u.%u\n", func, line, 336 p->static_ip_addr[0], p->static_ip_addr[1], 337 p->static_ip_addr[2], p->static_ip_addr[3]); 338 pr_debug("%s:%d: p.network_mask: %u.%u.%u.%u\n", func, line, 339 p->network_mask[0], p->network_mask[1], 340 p->network_mask[2], p->network_mask[3]); 341 pr_debug("%s:%d: p.default_gateway: %u.%u.%u.%u\n", func, line, 342 p->default_gateway[0], p->default_gateway[1], 343 p->default_gateway[2], p->default_gateway[3]); 344 pr_debug("%s:%d: p.dns_primary: %u.%u.%u.%u\n", func, line, 345 p->dns_primary[0], p->dns_primary[1], 346 p->dns_primary[2], p->dns_primary[3]); 347 pr_debug("%s:%d: p.dns_secondary: %u.%u.%u.%u\n", func, line, 348 p->dns_secondary[0], p->dns_secondary[1], 349 p->dns_secondary[2], p->dns_secondary[3]); 350} 351 352static int verify_header(const struct os_area_header *header) 353{ 354 if (memcmp(header->magic_num, OS_AREA_HEADER_MAGIC_NUM, 355 sizeof(header->magic_num))) { 356 pr_debug("%s:%d magic_num failed\n", __func__, __LINE__); 357 return -1; 358 } 359 360 if (header->hdr_version < 1) { 361 pr_debug("%s:%d hdr_version failed\n", __func__, __LINE__); 362 return -1; 363 } 364 365 if (header->db_area_offset > header->ldr_area_offset) { 366 pr_debug("%s:%d offsets failed\n", __func__, __LINE__); 367 return -1; 368 } 369 370 return 0; 371} 372 373static int db_verify(const struct os_area_db *db) 374{ 375 if (memcmp(db->magic_num, OS_AREA_DB_MAGIC_NUM, 376 sizeof(db->magic_num))) { 377 pr_debug("%s:%d magic_num failed\n", __func__, __LINE__); 378 return -EINVAL; 379 } 380 381 if (db->version != 1) { 382 pr_debug("%s:%d version failed\n", __func__, __LINE__); 383 return -EINVAL; 384 } 385 386 return 0; 387} 388 389struct db_index { 390 uint8_t owner:5; 391 uint8_t key:3; 392}; 393 394struct db_iterator { 395 const struct os_area_db *db; 396 struct os_area_db_id match_id; 397 struct db_index *idx; 398 struct db_index *last_idx; 399 union { 400 uint64_t *value_64; 401 uint32_t *value_32; 402 uint16_t *value_16; 403 }; 404}; 405 406static unsigned int db_align_up(unsigned int val, unsigned int size) 407{ 408 return (val + (size - 1)) & (~(size - 1)); 409} 410 411/** 412 * db_for_each_64 - Iterator for 64 bit entries. 413 * 414 * A NULL value for id can be used to match all entries. 415 * OS_AREA_DB_OWNER_ANY and OS_AREA_DB_KEY_ANY can be used to match all. 416 */ 417 418static int db_for_each_64(const struct os_area_db *db, 419 const struct os_area_db_id *match_id, struct db_iterator *i) 420{ 421next: 422 if (!i->db) { 423 i->db = db; 424 i->match_id = match_id ? *match_id : os_area_db_id_any; 425 i->idx = (void *)db + db->index_64; 426 i->last_idx = i->idx + db->count_64; 427 i->value_64 = (void *)db + db->index_64 428 + db_align_up(db->count_64, 8); 429 } else { 430 i->idx++; 431 i->value_64++; 432 } 433 434 if (i->idx >= i->last_idx) { 435 pr_debug("%s:%d: reached end\n", __func__, __LINE__); 436 return 0; 437 } 438 439 if (i->match_id.owner != OS_AREA_DB_OWNER_ANY 440 && i->match_id.owner != (int)i->idx->owner) 441 goto next; 442 if (i->match_id.key != OS_AREA_DB_KEY_ANY 443 && i->match_id.key != (int)i->idx->key) 444 goto next; 445 446 return 1; 447} 448 449static int db_delete_64(struct os_area_db *db, const struct os_area_db_id *id) 450{ 451 struct db_iterator i; 452 453 for (i.db = NULL; db_for_each_64(db, id, &i); ) { 454 455 pr_debug("%s:%d: got (%d:%d) %llxh\n", __func__, __LINE__, 456 i.idx->owner, i.idx->key, 457 (unsigned long long)*i.value_64); 458 459 i.idx->owner = 0; 460 i.idx->key = 0; 461 *i.value_64 = 0; 462 } 463 return 0; 464} 465 466static int db_set_64(struct os_area_db *db, const struct os_area_db_id *id, 467 uint64_t value) 468{ 469 struct db_iterator i; 470 471 pr_debug("%s:%d: (%d:%d) <= %llxh\n", __func__, __LINE__, 472 id->owner, id->key, (unsigned long long)value); 473 474 if (!id->owner || id->owner == OS_AREA_DB_OWNER_ANY 475 || id->key == OS_AREA_DB_KEY_ANY) { 476 pr_debug("%s:%d: bad id: (%d:%d)\n", __func__, 477 __LINE__, id->owner, id->key); 478 return -1; 479 } 480 481 db_delete_64(db, id); 482 483 i.db = NULL; 484 if (db_for_each_64(db, &os_area_db_id_empty, &i)) { 485 486 pr_debug("%s:%d: got (%d:%d) %llxh\n", __func__, __LINE__, 487 i.idx->owner, i.idx->key, 488 (unsigned long long)*i.value_64); 489 490 i.idx->owner = id->owner; 491 i.idx->key = id->key; 492 *i.value_64 = value; 493 494 pr_debug("%s:%d: set (%d:%d) <= %llxh\n", __func__, __LINE__, 495 i.idx->owner, i.idx->key, 496 (unsigned long long)*i.value_64); 497 return 0; 498 } 499 pr_debug("%s:%d: database full.\n", 500 __func__, __LINE__); 501 return -1; 502} 503 504static int db_get_64(const struct os_area_db *db, 505 const struct os_area_db_id *id, uint64_t *value) 506{ 507 struct db_iterator i; 508 509 i.db = NULL; 510 if (db_for_each_64(db, id, &i)) { 511 *value = *i.value_64; 512 pr_debug("%s:%d: found %lld\n", __func__, __LINE__, 513 (long long int)*i.value_64); 514 return 0; 515 } 516 pr_debug("%s:%d: not found\n", __func__, __LINE__); 517 return -1; 518} 519 520static int db_get_rtc_diff(const struct os_area_db *db, int64_t *rtc_diff) 521{ 522 return db_get_64(db, &os_area_db_id_rtc_diff, (uint64_t*)rtc_diff); 523} 524 525#define dump_db(a) _dump_db(a, __func__, __LINE__) 526static void _dump_db(const struct os_area_db *db, const char *func, 527 int line) 528{ 529 char str[sizeof(db->magic_num) + 1]; 530 531 dump_field(str, db->magic_num, sizeof(db->magic_num)); 532 pr_debug("%s:%d: db.magic_num: '%s'\n", func, line, 533 str); 534 pr_debug("%s:%d: db.version: %u\n", func, line, 535 db->version); 536 pr_debug("%s:%d: db.index_64: %u\n", func, line, 537 db->index_64); 538 pr_debug("%s:%d: db.count_64: %u\n", func, line, 539 db->count_64); 540 pr_debug("%s:%d: db.index_32: %u\n", func, line, 541 db->index_32); 542 pr_debug("%s:%d: db.count_32: %u\n", func, line, 543 db->count_32); 544 pr_debug("%s:%d: db.index_16: %u\n", func, line, 545 db->index_16); 546 pr_debug("%s:%d: db.count_16: %u\n", func, line, 547 db->count_16); 548} 549 550static void os_area_db_init(struct os_area_db *db) 551{ 552 enum { 553 HEADER_SIZE = offsetof(struct os_area_db, _db_data), 554 INDEX_64_COUNT = 64, 555 VALUES_64_COUNT = 57, 556 INDEX_32_COUNT = 64, 557 VALUES_32_COUNT = 57, 558 INDEX_16_COUNT = 64, 559 VALUES_16_COUNT = 57, 560 }; 561 562 memset(db, 0, sizeof(struct os_area_db)); 563 564 memcpy(db->magic_num, OS_AREA_DB_MAGIC_NUM, sizeof(db->magic_num)); 565 db->version = 1; 566 db->index_64 = HEADER_SIZE; 567 db->count_64 = VALUES_64_COUNT; 568 db->index_32 = HEADER_SIZE 569 + INDEX_64_COUNT * sizeof(struct db_index) 570 + VALUES_64_COUNT * sizeof(u64); 571 db->count_32 = VALUES_32_COUNT; 572 db->index_16 = HEADER_SIZE 573 + INDEX_64_COUNT * sizeof(struct db_index) 574 + VALUES_64_COUNT * sizeof(u64) 575 + INDEX_32_COUNT * sizeof(struct db_index) 576 + VALUES_32_COUNT * sizeof(u32); 577 db->count_16 = VALUES_16_COUNT; 578 579 /* Rules to check db layout. */ 580 581 BUILD_BUG_ON(sizeof(struct db_index) != 1); 582 BUILD_BUG_ON(sizeof(struct os_area_db) != 2 * OS_AREA_SEGMENT_SIZE); 583 BUILD_BUG_ON(INDEX_64_COUNT & 0x7); 584 BUILD_BUG_ON(VALUES_64_COUNT > INDEX_64_COUNT); 585 BUILD_BUG_ON(INDEX_32_COUNT & 0x7); 586 BUILD_BUG_ON(VALUES_32_COUNT > INDEX_32_COUNT); 587 BUILD_BUG_ON(INDEX_16_COUNT & 0x7); 588 BUILD_BUG_ON(VALUES_16_COUNT > INDEX_16_COUNT); 589 BUILD_BUG_ON(HEADER_SIZE 590 + INDEX_64_COUNT * sizeof(struct db_index) 591 + VALUES_64_COUNT * sizeof(u64) 592 + INDEX_32_COUNT * sizeof(struct db_index) 593 + VALUES_32_COUNT * sizeof(u32) 594 + INDEX_16_COUNT * sizeof(struct db_index) 595 + VALUES_16_COUNT * sizeof(u16) 596 > sizeof(struct os_area_db)); 597} 598 599/** 600 * update_flash_db - Helper for os_area_queue_work_handler. 601 * 602 */ 603 604static int update_flash_db(void) 605{ 606 const unsigned int buf_len = 8 * OS_AREA_SEGMENT_SIZE; 607 struct os_area_header *header; 608 ssize_t count; 609 int error; 610 loff_t pos; 611 struct os_area_db* db; 612 613 /* Read in header and db from flash. */ 614 615 header = kmalloc(buf_len, GFP_KERNEL); 616 if (!header) 617 return -ENOMEM; 618 619 count = os_area_flash_read(header, buf_len, 0); 620 if (count < 0) { 621 pr_debug("%s: os_area_flash_read failed %zd\n", __func__, 622 count); 623 error = count; 624 goto fail; 625 } 626 627 pos = header->db_area_offset * OS_AREA_SEGMENT_SIZE; 628 if (count < OS_AREA_SEGMENT_SIZE || verify_header(header) || 629 count < pos) { 630 pr_debug("%s: verify_header failed\n", __func__); 631 dump_header(header); 632 error = -EINVAL; 633 goto fail; 634 } 635 636 /* Now got a good db offset and some maybe good db data. */ 637 638 db = (void *)header + pos; 639 640 error = db_verify(db); 641 if (error) { 642 pr_notice("%s: Verify of flash database failed, formatting.\n", 643 __func__); 644 dump_db(db); 645 os_area_db_init(db); 646 } 647 648 /* Now got good db data. */ 649 650 db_set_64(db, &os_area_db_id_rtc_diff, saved_params.rtc_diff); 651 652 count = os_area_flash_write(db, sizeof(struct os_area_db), pos); 653 if (count < 0 || count < sizeof(struct os_area_db)) { 654 pr_debug("%s: os_area_flash_write failed %zd\n", __func__, 655 count); 656 error = count < 0 ? count : -EIO; 657 } 658 659fail: 660 kfree(header); 661 return error; 662} 663 664/** 665 * os_area_queue_work_handler - Asynchronous write handler. 666 * 667 * An asynchronous write for flash memory and the device tree. Do not 668 * call directly, use os_area_queue_work(). 669 */ 670 671static void os_area_queue_work_handler(struct work_struct *work) 672{ 673 struct device_node *node; 674 int error; 675 676 pr_debug(" -> %s:%d\n", __func__, __LINE__); 677 678 node = of_find_node_by_path("/"); 679 if (node) { 680 os_area_set_property(node, &property_rtc_diff); 681 of_node_put(node); 682 } else 683 pr_debug("%s:%d of_find_node_by_path failed\n", 684 __func__, __LINE__); 685 686 error = update_flash_db(); 687 if (error) 688 pr_warn("%s: Could not update FLASH ROM\n", __func__); 689 690 pr_debug(" <- %s:%d\n", __func__, __LINE__); 691} 692 693static void os_area_queue_work(void) 694{ 695 static DECLARE_WORK(q, os_area_queue_work_handler); 696 697 wmb(); 698 schedule_work(&q); 699} 700 701/** 702 * ps3_os_area_save_params - Copy data from os area mirror to @saved_params. 703 * 704 * For the convenience of the guest the HV makes a copy of the os area in 705 * flash to a high address in the boot memory region and then puts that RAM 706 * address and the byte count into the repository for retrieval by the guest. 707 * We copy the data we want into a static variable and allow the memory setup 708 * by the HV to be claimed by the memblock manager. 709 * 710 * The os area mirror will not be available to a second stage kernel, and 711 * the header verify will fail. In this case, the saved_params values will 712 * be set from flash memory or the passed in device tree in ps3_os_area_init(). 713 */ 714 715void __init ps3_os_area_save_params(void) 716{ 717 int result; 718 u64 lpar_addr; 719 unsigned int size; 720 struct os_area_header *header; 721 struct os_area_params *params; 722 struct os_area_db *db; 723 724 pr_debug(" -> %s:%d\n", __func__, __LINE__); 725 726 result = ps3_repository_read_boot_dat_info(&lpar_addr, &size); 727 728 if (result) { 729 pr_debug("%s:%d ps3_repository_read_boot_dat_info failed\n", 730 __func__, __LINE__); 731 return; 732 } 733 734 header = (struct os_area_header *)__va(lpar_addr); 735 params = (struct os_area_params *)__va(lpar_addr 736 + OS_AREA_SEGMENT_SIZE); 737 738 result = verify_header(header); 739 740 if (result) { 741 /* Second stage kernels exit here. */ 742 pr_debug("%s:%d verify_header failed\n", __func__, __LINE__); 743 dump_header(header); 744 return; 745 } 746 747 db = (struct os_area_db *)__va(lpar_addr 748 + header->db_area_offset * OS_AREA_SEGMENT_SIZE); 749 750 dump_header(header); 751 dump_params(params); 752 dump_db(db); 753 754 result = db_verify(db) || db_get_rtc_diff(db, &saved_params.rtc_diff); 755 if (result) 756 saved_params.rtc_diff = params->rtc_diff ? params->rtc_diff 757 : SECONDS_FROM_1970_TO_2000; 758 saved_params.av_multi_out = params->av_multi_out; 759 saved_params.valid = 1; 760 761 memset(header, 0, sizeof(*header)); 762 763 pr_debug(" <- %s:%d\n", __func__, __LINE__); 764} 765 766/** 767 * ps3_os_area_init - Setup os area device tree properties as needed. 768 */ 769 770void __init ps3_os_area_init(void) 771{ 772 struct device_node *node; 773 774 pr_debug(" -> %s:%d\n", __func__, __LINE__); 775 776 node = of_find_node_by_path("/"); 777 778 if (!saved_params.valid && node) { 779 /* Second stage kernels should have a dt entry. */ 780 os_area_get_property(node, &property_rtc_diff); 781 os_area_get_property(node, &property_av_multi_out); 782 } 783 784 if(!saved_params.rtc_diff) 785 saved_params.rtc_diff = SECONDS_FROM_1970_TO_2000; 786 787 if (node) { 788 os_area_set_property(node, &property_rtc_diff); 789 os_area_set_property(node, &property_av_multi_out); 790 of_node_put(node); 791 } else 792 pr_debug("%s:%d of_find_node_by_path failed\n", 793 __func__, __LINE__); 794 795 pr_debug(" <- %s:%d\n", __func__, __LINE__); 796} 797 798/** 799 * ps3_os_area_get_rtc_diff - Returns the rtc diff value. 800 */ 801 802u64 ps3_os_area_get_rtc_diff(void) 803{ 804 return saved_params.rtc_diff; 805} 806EXPORT_SYMBOL_GPL(ps3_os_area_get_rtc_diff); 807 808/** 809 * ps3_os_area_set_rtc_diff - Set the rtc diff value. 810 * 811 * An asynchronous write is needed to support writing updates from 812 * the timer interrupt context. 813 */ 814 815void ps3_os_area_set_rtc_diff(u64 rtc_diff) 816{ 817 if (saved_params.rtc_diff != rtc_diff) { 818 saved_params.rtc_diff = rtc_diff; 819 os_area_queue_work(); 820 } 821} 822EXPORT_SYMBOL_GPL(ps3_os_area_set_rtc_diff); 823 824/** 825 * ps3_os_area_get_av_multi_out - Returns the default video mode. 826 */ 827 828enum ps3_param_av_multi_out ps3_os_area_get_av_multi_out(void) 829{ 830 return saved_params.av_multi_out; 831} 832EXPORT_SYMBOL_GPL(ps3_os_area_get_av_multi_out); 833